US11926961B2 - Pressure screen and method for dilution for a pressure screen - Google Patents

Pressure screen and method for dilution for a pressure screen Download PDF

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Publication number
US11926961B2
US11926961B2 US17/733,034 US202217733034A US11926961B2 US 11926961 B2 US11926961 B2 US 11926961B2 US 202217733034 A US202217733034 A US 202217733034A US 11926961 B2 US11926961 B2 US 11926961B2
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screen
reject
dilution water
amount
area
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US20220349124A1 (en
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Alexander Gscheider
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Andritz China Ltd
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Andritz China Ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/06—Rotary screen-drums
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/16—Cylinders and plates for screens

Definitions

  • the inventive embodiments relate to a method for dilution for a pressure screen and a related pressure screen.
  • Pressure screens equipped with rotors and screen baskets or screen plates are commonly used to screen out impurities from fiber suspensions.
  • the most common used screens are basket type screens operating under an outflow principle, which means inside of a perforated or slotted basket there is a rotor, which continuously cleans the screening surface at a certain distance.
  • Adding water into the screening zone usually involves complicated structures. Dilution water added to the reject area is usually in an amount within a range of 20-40% of the reject flow by volume. Usually, when the dilution water amount is above 40% of the reject flow, the motor load increases due to reject flow restriction in the screening zone caused by the fact that the dilution water is added into the reject room below the screening area (screen basket). In that case the dilution water only reduces the consistency in the reject room of the screen and not in the screening zone between rotor and basket. In other words, when dilution water flows towards the screening zone, due to the high consistency in the screening zone, it is hard for the dilution water to flow deeper into the screening zone to actually reduce the consistency.
  • FIG. 2 Another pressure screen is provided with reference to FIG. 2 , which comprises a dilution water adding apparatus, which is adapted for adding dilution water directly into the screening area of the pressure screen, wherein the amount of the dilution water added into the screening zone can be 40-70% of the reject flow.
  • the dilution ends up essentially shooting directly through the screen basket into the accept area and is therefore not utilized well for reducing the consistency in the screening area.
  • this kind of configuration is complicated and costly.
  • dilution water is added as widely used at the reject area; however, the amount of dilution water dosage differs and provides a significant advantage. As mentioned above, if dilution water reaches more than 40% of the reject flow, screen operation becomes difficult, power is increased and plugging and motor overloading is commonly observed. However, with the disclosed embodiments, it has been found that if the dilution water amount is even higher than the reject flow by volume, the thickening factor keeps decreasing and the motor load even comes down.
  • a method for dilution for a pressure screen comprises a rotor rotating inside a screen with a distance to the screen. Feeding stock is supplied into a screening zone formed by the spacing between the rotor and the screen. Some feeding stock goes through the screen into an accept area to become accept, and the remaining feeding stock is discharged into a reject area as reject flow.
  • the amount of the dilution water added into the reject area is 0.8 to 3.5 times by volume, preferably 1.6 to 2.2 times of the amount of the reject flow, depending on the screening stage and the supply.
  • a pressure screen in another embodiment, comprises a dilution water adding apparatus configured for adding dilution water directly into the reject area of the pressure screen.
  • the amount of the dilution water added into the reject flow is 0.8 to 3.5 times by volume, preferably 1.6 to 2.2 times of the amount of the reject flow.
  • the effect depends significantly on the rotor design itself.
  • features for enhancing the distribution of the dilution water in the screening zone are provided on the rotor. It has been found that ribs or similar protruding structures provided on the front and back side of the foils on the rotor may enhance the distribution of the dilution water in the screening zone, and thus the rotor shows very stable operation even at a reject rate below 5%.
  • FIG. 1 schematically shows a section of a pressure screen with dilution water being added into its reject area.
  • FIG. 2 schematically shows a section of a pressure screen with dilution water being added into its screening zone via certain designed pipelines.
  • FIGS. 3 A, 3 B and 3 C schematically show the front and back side of the foils for use within the disclosed embodiments and a rotor with foils.
  • the dilution water D is still added into the reject area 20 of the pressure screen 100 , similar to known methods and systems, however, the amount of the dilution water D added into the reject flow R is 0.8 to 3.5 times of the amount of the reject flow R via a dilution water adding apparatus adapted to do so (not shown).
  • a rotor 40 rotates inside the screen 60 spaced from the screen 60 a distance.
  • Feeding stock F is supplied into a screening zone 10 defined by the spacing between the rotor 40 and the screen 60 .
  • Some feeding stock F passes through the screen 60 into the accept area 30 and becomes accept A, and the remaining feeding stock F is discharged into a reject area 20 as reject flow R.
  • pipelines like those shown as reference numeral 80 in prior art system of FIG. 2 for supplying dilution water D into the screening zone 10 are omitted.
  • inventive embodiments that include the disclosed rotor the same or even better screening effects are surprisingly obtained at lower energy consumption levels as compared with conventional structures that utilize conventional rotors which operate like the systems shown in FIG. 1 or FIG. 2 .
  • foils 70 can be provided on the rotor 40 to improve the flow condition in the screening zone 10 .
  • ribs 50 or similar protruding structures are provided on the front and rears side of the foils 70 which enhance distribution of the dilution water D in the screening zone 10 .
  • the foils 70 with ribs 50 may be employed within a variety of pressure screen systems, including without limitation those shown generally in FIGS. 1 and 2 , for improving flow conditions thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
US17/733,034 2021-04-30 2022-04-29 Pressure screen and method for dilution for a pressure screen Active US11926961B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110482017.5A CN113215848B (zh) 2021-04-30 2021-04-30 压力筛和用于压力筛的稀释方法
CN202110482017.5 2021-04-30

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US20220349124A1 US20220349124A1 (en) 2022-11-03
US11926961B2 true US11926961B2 (en) 2024-03-12

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US17/733,034 Active US11926961B2 (en) 2021-04-30 2022-04-29 Pressure screen and method for dilution for a pressure screen

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US (1) US11926961B2 (de)
EP (1) EP4083317A1 (de)
CN (1) CN113215848B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111001960B (zh) * 2019-12-18 2021-06-11 安德里茨（中国）有限公司 扬克缸缸段预加工件以及用于制造扬克缸的方法
CA3237289A1 (en) * 2022-04-21 2023-09-21 Iii John Joseph Egan Rotor with forward-swept struts for pressure screen cylinders

Citations (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067800A (en) * 1976-12-06 1978-01-10 Ingersoll-Rand Company Screening apparatus
US4267035A (en) * 1979-08-27 1981-05-12 The Black Clawson Company Pressurized rotary screening apparatus
US4634521A (en) * 1983-10-25 1987-01-06 Ahlstrom Corp Screening apparatus with light reject removal
US5078878A (en) * 1988-03-07 1992-01-07 Bird Escher Wyss Pressure knotter screening apparatus
US5221437A (en) * 1991-07-08 1993-06-22 The Black Clawson Company Screening apparatus for paper making stock
WO1993023609A1 (en) * 1992-05-19 1993-11-25 Pom Technology Oy Ab Process and apparatus for the screening of a pulp suspension
US5564572A (en) * 1993-10-20 1996-10-15 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Method and apparatus for screening waste paper pulp
US5798025A (en) * 1997-03-13 1998-08-25 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Apparatus for screening waste paper pulp
US6585116B1 (en) * 2000-02-22 2003-07-01 Voith Sulzer Paper Technology North America, Inc. Screening apparatus for fiber suspension
WO2003091497A1 (en) * 2002-04-24 2003-11-06 Frejborg Frey A A screen section, screen cylinder, screening device, and method of screening fibrous material
US6679384B1 (en) * 1999-02-26 2004-01-20 Kadant Lamort Method and means for paper pulp filtering
US6702120B1 (en) * 1999-03-29 2004-03-09 Valmet Fibertech Ab Screening apparatus including two screen means
US6726022B2 (en) * 2000-02-08 2004-04-27 Valmet Fibertech Ab Screening device and rotor for use in a screening device
WO2004046457A1 (en) * 2002-11-19 2004-06-03 Advanced Fiber Technologies (Aft) Oy Method and apparatus for treating fiber suspension
US20050126986A1 (en) * 2003-12-15 2005-06-16 Aikawa Iron Works Co., Ltd Papermaking screen device
DE102004039712A1 (de) * 2004-08-17 2006-03-16 Voith Paper Patent Gmbh Verfahren zum dosierten Transport einer störstoffhaltigen Suspension durch einen einstellbaren Drosselschieber
US20060065589A1 (en) * 2004-09-29 2006-03-30 Giancarlo Dal Maso Strainer for cleaning fibrous suspensions
US20060070924A1 (en) * 2002-06-07 2006-04-06 Metso Paper, Inc. Multi-stage screening apparatus screen basket and method for screening pulp suspensions
US20060076278A1 (en) * 2004-09-27 2006-04-13 Aikawa Iron Works Co., Ltd. Screen device
US20070114157A1 (en) * 2003-12-04 2007-05-24 Metso Paper, Inc. Screening apparatus for screening pulp suspensions and method of operating the apparatus
US20070215526A1 (en) * 2006-03-20 2007-09-20 Aikawa Iron Works Co.,Ltd Screen device
US20070246181A1 (en) * 2003-11-06 2007-10-25 Metso Paper, Inc. Screening Apparatus and Screen Basket for Screening Pulp Suspensions
US20100288681A1 (en) * 2009-05-12 2010-11-18 Gl&V Fiance Hungary Kft. Two stage pulp screening device with two stationary cylindrical screens
WO2011076660A1 (de) * 2009-12-25 2011-06-30 Voith Patent Gmbh Verfahren und siebvorrichtung zum sieben einer faserstoffsuspension
DE102011085691A1 (de) * 2010-11-05 2012-05-10 Metso Paper, Inc. Sortierer und Verfahren zur Sichtung von Fasermasse
US20130001151A1 (en) * 2010-03-16 2013-01-03 Jouko Hautala Pressure filter
WO2013083509A1 (de) * 2011-12-09 2013-06-13 Voith Patent Gmbh Siebvorrichtung zum sieben einer faserstoffsuspension
US8869989B2 (en) * 2012-12-12 2014-10-28 Ovivo Luxembourg S.Å.R.L. Pulp screen rotor with slurry passages around and through the rotor
US20150345077A1 (en) * 2012-11-28 2015-12-03 Valmet Ab Screening apparatus, rotor, wing package and method for manufacture
US20170159239A1 (en) * 2015-12-02 2017-06-08 Aikawa Iron Works Co., Ltd. Papermaking screen device
US20190048524A1 (en) * 2016-03-16 2019-02-14 Red Wire Oy Method for screening and a screening apparatus
CN111364274A (zh) * 2020-04-30 2020-07-03 郑州磊展科技造纸机械有限公司 一种新型压力筛
CN212077480U (zh) * 2020-04-30 2020-12-04 郑州磊展科技造纸机械有限公司 一种加强排渣能力的降流式压力筛壳体

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI92227C (fi) * 1992-04-23 1994-10-10 Ahlstroem Oy Laite kuitususpension käsittelemiseksi
US5497886A (en) * 1992-07-13 1996-03-12 Ingersoll-Rand Company Screening apparatus for papermaking pulp
CN1176270C (zh) * 2000-03-09 2004-11-17 吴解生 疏磨筛浆机
CN201416118Y (zh) * 2009-05-26 2010-03-03 山东杰锋机械制造有限公司 单效纤维分离机的控制系统

Patent Citations (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067800A (en) * 1976-12-06 1978-01-10 Ingersoll-Rand Company Screening apparatus
US4267035A (en) * 1979-08-27 1981-05-12 The Black Clawson Company Pressurized rotary screening apparatus
US4634521A (en) * 1983-10-25 1987-01-06 Ahlstrom Corp Screening apparatus with light reject removal
US5078878A (en) * 1988-03-07 1992-01-07 Bird Escher Wyss Pressure knotter screening apparatus
US5221437A (en) * 1991-07-08 1993-06-22 The Black Clawson Company Screening apparatus for paper making stock
WO1993023609A1 (en) * 1992-05-19 1993-11-25 Pom Technology Oy Ab Process and apparatus for the screening of a pulp suspension
US5564572A (en) * 1993-10-20 1996-10-15 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Method and apparatus for screening waste paper pulp
US5798025A (en) * 1997-03-13 1998-08-25 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Apparatus for screening waste paper pulp
US6679384B1 (en) * 1999-02-26 2004-01-20 Kadant Lamort Method and means for paper pulp filtering
US6702120B1 (en) * 1999-03-29 2004-03-09 Valmet Fibertech Ab Screening apparatus including two screen means
US6726022B2 (en) * 2000-02-08 2004-04-27 Valmet Fibertech Ab Screening device and rotor for use in a screening device
US6585116B1 (en) * 2000-02-22 2003-07-01 Voith Sulzer Paper Technology North America, Inc. Screening apparatus for fiber suspension
WO2003091497A1 (en) * 2002-04-24 2003-11-06 Frejborg Frey A A screen section, screen cylinder, screening device, and method of screening fibrous material
US20060070924A1 (en) * 2002-06-07 2006-04-06 Metso Paper, Inc. Multi-stage screening apparatus screen basket and method for screening pulp suspensions
WO2004046457A1 (en) * 2002-11-19 2004-06-03 Advanced Fiber Technologies (Aft) Oy Method and apparatus for treating fiber suspension
US20070246181A1 (en) * 2003-11-06 2007-10-25 Metso Paper, Inc. Screening Apparatus and Screen Basket for Screening Pulp Suspensions
US20070114157A1 (en) * 2003-12-04 2007-05-24 Metso Paper, Inc. Screening apparatus for screening pulp suspensions and method of operating the apparatus
US20050126986A1 (en) * 2003-12-15 2005-06-16 Aikawa Iron Works Co., Ltd Papermaking screen device
DE102004039712A1 (de) * 2004-08-17 2006-03-16 Voith Paper Patent Gmbh Verfahren zum dosierten Transport einer störstoffhaltigen Suspension durch einen einstellbaren Drosselschieber
US20060076278A1 (en) * 2004-09-27 2006-04-13 Aikawa Iron Works Co., Ltd. Screen device
US20060065589A1 (en) * 2004-09-29 2006-03-30 Giancarlo Dal Maso Strainer for cleaning fibrous suspensions
US20070215526A1 (en) * 2006-03-20 2007-09-20 Aikawa Iron Works Co.,Ltd Screen device
US20100288681A1 (en) * 2009-05-12 2010-11-18 Gl&V Fiance Hungary Kft. Two stage pulp screening device with two stationary cylindrical screens
WO2011076660A1 (de) * 2009-12-25 2011-06-30 Voith Patent Gmbh Verfahren und siebvorrichtung zum sieben einer faserstoffsuspension
US20130001151A1 (en) * 2010-03-16 2013-01-03 Jouko Hautala Pressure filter
DE102011085691A1 (de) * 2010-11-05 2012-05-10 Metso Paper, Inc. Sortierer und Verfahren zur Sichtung von Fasermasse
WO2013083509A1 (de) * 2011-12-09 2013-06-13 Voith Patent Gmbh Siebvorrichtung zum sieben einer faserstoffsuspension
US20150345077A1 (en) * 2012-11-28 2015-12-03 Valmet Ab Screening apparatus, rotor, wing package and method for manufacture
US8869989B2 (en) * 2012-12-12 2014-10-28 Ovivo Luxembourg S.Å.R.L. Pulp screen rotor with slurry passages around and through the rotor
US20170159239A1 (en) * 2015-12-02 2017-06-08 Aikawa Iron Works Co., Ltd. Papermaking screen device
US20190048524A1 (en) * 2016-03-16 2019-02-14 Red Wire Oy Method for screening and a screening apparatus
CN111364274A (zh) * 2020-04-30 2020-07-03 郑州磊展科技造纸机械有限公司 一种新型压力筛
CN212077480U (zh) * 2020-04-30 2020-12-04 郑州磊展科技造纸机械有限公司 一种加强排渣能力的降流式压力筛壳体

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US20220349124A1 (en) 2022-11-03
CN113215848B (zh) 2023-05-26
EP4083317A1 (de) 2022-11-02
CN113215848A (zh) 2021-08-06

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